The slave ship Union departed on a transatlantic slave-trading voyage that would carry enslaved Africans to Martinique.

Vessel: Union; flag: France; estimated standardized tonnage: 272.3. People recorded in connection with the voyage: Investor: Montaudoin, René; Captain: Negre, François. The voyage began at Nantes on 11 May 1721. Principal recorded place where captives were acquired: Whydah, Ouidah (Bight of Benin). Principal recorded disembarkation place: Martinique, place unspecified. Estimated mortality during the crossing: 6.0%. Recorded outcome: Voyage completed as intended.